House Intelligence Committee Wants To Hear From DHS Whistleblower

A whistleblower from the Department of Homeland Security, Brian Murphy, alleges that department leaders, including acting DHS Secretary Chad Wolf, pressured him to alter intelligence reports to align with President Trump's views. The reports were allegedly modified to downplay the threats posed by Russia and white supremacy. Murphy claims that some requests came directly from White House national security adviser Robert O'Brien. Both the White House and DHS have denied these allegations.

Who did Murphy say was involved in the requests to alter intelligence notifications?

What was the response from the Department of Homeland Security regarding Murphy's claims?